(バージョン情報なし。おそらく SVN 版にしか存在しないでしょう)
Imagick::count — Description
$mode
] )Returns the number of images.
modeAn unused argument. Currently there is a non-particularly well defined feature in PHP where calling count() on a countable object might (or might not) require this method to accept a parameter. This parameter is here to be conformant with the interface of countable, even though the param is not used.